<template>
  <div class="tags" v-if="showTags">
    <ul>
      <li
        class="tags-li"
        v-for="(item, index) in tagsList"
        :class="{ active: isActive(item.path) }"
        :key="index"
      >
        <router-link :to="item.path" class="tags-li-title">
          {{ item.title }}
        </router-link>
        <span class="tags-li-icon" @click="closeTags(index)"
          ><i class="el-icon-close"></i
        ></span>
      </li>
    </ul>
    <div class="tags-close-box">
      <el-dropdown @command="handleTags">
        <el-button size="mini" type="primary">
          标签选项<i class="el-icon-arrow-down el-icon--right"></i>
        </el-button>
        <el-dropdown-menu size="small" slot="dropdown">
          <el-dropdown-item command="other">关闭其他</el-dropdown-item>
          <el-dropdown-item command="all">关闭所有</el-dropdown-item>
        </el-dropdown-menu>
      </el-dropdown>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      tagsList: [],
    };
  },
  created() {
    this.setTags(this.$route);
  },
  methods: {
    // 设置标签
    setTags(route) {
      if (route.path === '/welcome') return
      const isExist = this.tagsList.some((item) => {
        return item.path === route.fullPath;
      });
      if (!isExist) {
        if (this.tagsList.length > 8) {
          this.tagsList.shift();
        }
        this.tagsList.push({
          title: route.meta.title,
          path: route.fullPath,
          name: route.name,
        });
      }
      this.changeParentTags();
    },

    changeParentTags() {
      this.$emit("tags", this.tagsList);
    },
    // 关闭单个标签
    closeTags(index) {
      const delItem = this.tagsList.splice(index, 1)[0];
      console.log(this.tagsList,'this.tagsList')
      console.log(delItem,'delItem')
      const item = this.tagsList[index]
        ? this.tagsList[index]
        : this.tagsList[index - 1];
             console.log(item,'item')
      if (item) {
        delItem.path === this.$route.fullPath && this.$router.push(item.path);
      } else {
        this.$router.push("/");
      }
    },
    // 关闭全部标签
    closeAll() {
      this.tagsList = [];
      this.$router.push('/');
    },
    // 关闭其他标签
    closeOther() {
      const curItem = this.tagsList.filter((item) => {
        return item.path === this.$route.fullPath;
      });
      this.tagsList = curItem;
    },
    // 是否激活当前tag
    isActive(path) {
      return path === this.$route.fullPath;
    },
    handleTags(command) {
      command === "other" ? this.closeOther() : this.closeAll();
    },
  },
  computed: {
    // 是否展示tag组件
    showTags() {
      return this.tagsList.length > 0;
    },
  },
  watch: {
    $route(newValue, oldValue) {
      this.setTags(newValue);
    },
  },
};
</script>

<style lang="less" scoped>
.tags {
  position: relative;
  height: 30px;
  overflow: hidden;
  background: #fff;
  padding-right: 120px;
  box-shadow: 0 5px 10px #ddd;

  .tags-close-box {
    position: absolute;
    right: 0;
    top: 0;
    box-sizing: border-box;
    padding-top: 1px;
    text-align: center;
    width: 110px;
    height: 30px;
    background: #fff;
    box-shadow: -3px 0 15px 3px rgba(0, 0, 0, 0.1);
    z-index: 10;
    .el-button--primary {
      margin-top:1px;
      border: none;
      background-color: #00D1B2;
    }
  }

  ul {
    box-sizing: border-box;
    width: 100%;
    height: 100%;

    .tags-li {
      float: left;
      margin: 3px 5px 2px 3px;
      border-radius: 3px;
      font-size: 12px;
      overflow: hidden;
      cursor: pointer;
      // height: 23px;
      line-height: 23px;
      border: 1px solid #e9eaec;
      background: #fff;
      padding: 0 5px 0 12px;
      vertical-align: middle;
      color: #666;
      -webkit-transition: all 0.3s ease-in;
      -moz-transition: all 0.3s ease-in;
      transition: all 0.3s ease-in;

      .tags-li-title {
        color: #666;
      }
    }
    .active {
      border: 1px solid #409eff !important;
      background-color: #409eff !important;
    }
    .tags-li:not(.active):hover {
      background: #f8f8f8;
    }
    .tags-li.active {
      .tags-li-title {
        float: left;
        max-width: 80px;
        overflow: hidden;
        white-space: nowrap;
        text-overflow: ellipsis;
        margin-right: 5px;
        color: #fff !important;
      }
      .el-icon-close:before {
        color: #fff;
      }
    }

    // .tags-li {
    //   float: left;
    //   margin: 3px 5px 2px 3px;
    //   border-radius: 3px;
    //   font-size: 12px;
    //   overflow: hidden;
    //   cursor: pointer;
    //   height: 23px;
    //   line-height: 23px;
    //   border: 1px solid #e9eaec;
    //   background: #fff;
    //   padding: 0 5px 0 12px;
    //   vertical-align: middle;
    //   color: #666;
    //   -webkit-transition: all 0.3s ease-in;
    //   -moz-transition: all 0.3s ease-in;
    //   transition: all 0.3s ease-in;

    //   &:not(.active):hover {
    //     background: #f8f8f8;
    //   }

    //   .active {
    //     color: #fff;
    //   }
    //   .tags-li-title {
    //     float: left;
    //     max-width: 80px;
    //     overflow: hidden;
    //     white-space: nowrap;
    //     text-overflow: ellipsis;
    //     margin-right: 5px;
    //     color: #666;
    //   }
    //   .tags-close-box {
    //     position: absolute;
    //     right: 0;
    //     top: 0;
    //     box-sizing: border-box;
    //     padding-top: 1px;
    //     text-align: center;
    //     width: 110px;
    //     height: 30px;
    //     background: #fff;
    //     box-shadow: -3px 0 15px 3px rgba(0, 0, 0, 0.1);
    //     z-index: 10;
    //   }
    // }
  }
}
</style>